/*
    sw32_graph.c

	(description)

	Copyright (C) 1996-1997  Id Software, Inc.

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include "string.h"
#endif
#ifdef HAVE_STRINGS_H
# include "strings.h"
#endif

#include "QF/cvar.h"
#include "QF/draw.h"
#include "QF/render.h"
#include "QF/sys.h"

#include "r_local.h"
#include "r_cvar.h"

/*
  R_LineGraph

  Only called by R_DisplayTime
*/
void
R_LineGraph (int x, int y, int *h_vals, int count)
{
	int			h, i, s, color;

// FIXME: disable on no-buffer adapters, or put in the driver
	s = r_graphheight->int_val;

	h = *h_vals++;

	if (h == 10000)
		color = 0x6f;					// yellow
	else if (h == 9999)
		color = 0x4f;					// red
	else if (h == 9998)
		color = 0xd0;					// blue
	else
		color = 0xfe;					// white // LordHavoc: was pink (0xff)
 
	if (h > s)
		h = s;

	switch(r_pixbytes) {
	case 1:
	{
		byte *dest = (byte *) vid.buffer + vid.rowbytes * y + x;
		for (i = 0; i < h; i++, dest -= vid.rowbytes * 2)
			*dest = color;
	}
	break;
	case 2:
	{
		short *dest = (short *) vid.buffer + (vid.rowbytes >> 1) * y + x;
		color = d_8to16table[color];
		for (i = 0; i < h; i++, dest -= vid.rowbytes)
			*dest = color;
	}
	break;
	case 4:
	{
		int *dest = (int *) vid.buffer + (vid.rowbytes >> 2) * y + x;
		color = d_8to24table[color];
		for (i = 0; i < h; i++, dest -= (vid.rowbytes >> 1))
			*dest = color;
	}
	break;
	default:
		Sys_Error("R_LineGraph: unsupported r_pixbytes %i\n", r_pixbytes);
	}
}